camera not working help please

I have a problem with a Webcam, when me and my friend use the room and turn the webcams on I can see myself but my friend doesn’t and vice versa. We tried everything that u suggested to fix it but it didn’t help!!!
we use phones, not computers

Can both of you run the test on this site and let me know if there are any errors reported:

Hi Florian,

I ran this test also:-

Can you let me know if I have a problem please.

Kindest regards

There seem to be some issues with your network connection. How are you connected to the internet? Are you using some kind of VPN Service?